Carl salomon



(No Model.)

C. SALOMON. DRYING, DESIGGATING, AND ROASTING APPARATUS. No. 461,550.Patented 00t.20,1891.

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UNITED STATES PATENT OFFICE.

CART. SALOMON, OF BRUNSVIOK, GERMANY.

DRYING, DEsIccATlNG, AND RoAsTlNe APPARATUS.

SPECIFICATION forming part of Letters Patent No. 461,550, dated October20, 1891.

Application tiled May 25, 1889. Serial No. 312.116. (No model.)

To all whom, t may concern:

Be it known that I, CARL SALOMON, of the town of Brunswick, in the,German Empire, have invented certain new and useful Iniprovements inDrying, Desiccating, and Roasting Apparatus, of which the following is aspecification.

My invention relates to an apparatus for uniformly drying, desiccating,and roasting various products.

In the accompanying drawings, Figure l is a longitudinal section of myimproved apparatus. Fig. 2 is an end View, and Fig. 3 a section on theline a; y in Fig. l.

The material to be roasted, dried, or desiccated is t'ed into the rotarydrum, which is tapered toward both ends through the one hollow shaft,while the other serves to lead in the gaseous or other matter foreffecting the drying, desiccating, or roasting process. The interior ofthe drum is provided with helical or screw-like surfaces, the object ofthe same being on the one hand to intimateiy mix the product or materialto be treated and hold the same in suspension or continuously floatingin the air; on the other hand, to allow the apparatus to act asventilator and exhauster for driving the gaseous products of combustionthrough the apparatus, so as to enable the same to exercise their actionon the material to be treated. The centrifugal force created by therotary movement of the drum tends toforce the material to be treatedagainst the inner periphery of the said drum, and not only securelyretain the said material in this position, but in such case prevent theheat and the gas or gases led into the said drum from acting uniformlyon the said material to be treated. Now, in order to prevent thisinjurious centrifugal action helical or screwflike surfaces areemployed, which counteract this said centrifugal action and continuouslythrow the material to be treated toward the center of the apparatus, sothat the heat and the gases introduced into the drum can act perfectlyon the material under treatment, said material being held in suspensionor floating in the air by the action of the helical surfaces d d. Thehelicallyformed guide wings or surfaces d d in the one half vof the drumare arranged in opposite direction to those in the other half of the donot at their larger ends come in contact' with each other, but areconnected by thin staves a, which have little effect in reducing thefree cross-section of the apparatus. The central portion of the drum isclosed by a circular slide b, which is operated from the exterior of theapparatus by means of the handle c, so that when the slide is opened thetreated material will suddenly fall into the annular receptacle lL',which runs around the drum. The drum is held in the frame by means ofguide-rollers e e', Figs. l and 2, and is rotated from the driving-shaftby means of one or more gear-Wheels, as represented in Fig. 2.

The charging-tubef, with lateral hopper f enters the aXis of the drum atthe one end, whereas the tube g, provided with the socket g', entersaxially at the other side of the said drum ct and serves to lead in theproducts of combustion and eventually also air, said tube g and socket gbeing provided with appropriate throttle-valves 71 7L for regulating thesupply.

The operation of my improved drying, desiecating, and roasting apparatusis as follows: The material or product to be treated is charged into thedrum a through the hopper f and tube f, is impelled by centrifugal forceagainst the walls ot' the apparatus, is thenl distributed by the helicalguide-surfaces d,

and held in suspension in the said drum a. The products of combustionentering through the tube g at the opposite side of the drum a aredistributed uniformly by the spiral or screw k, and are fed to thematerial to be treated by the helical guide-surfaces, said products ofcombustion escaping through the tube f after having operated on thematerial or products in the drum a. The temperature may be observed byusing an appropriate pyrometer, and the progress of the operation beascertained by taking samples from time to time through the opening m,which is usually held tight by means of a suitable lid or cover. As soonas the product or material under treatment is properly dried,desiccated, or roasted the handle c of the slide b is drawn IOS g, andthe helical or screw-like surfaces or ways d d in the two halves, withthose in one half arranged in an opposite direction to those in theother halt', and the screw 7c at the inner end of the tube g, allarranged to coact substantially as and for the purpose specified. Inwitness whereof I have hereunto signed my name in the presence of twosubscribing Witnesses.

CARL SALOMON. Witnesses:

ARTHUR BAERMANN, WILHELM Voer.

